Quiz of the basic knowledge of statistics

　The answer of quiz is white letter.

Question 1

　What is the average, median and mode of the data on under place.
19 15 18 13 16 14 18 14 17 11 16 14 16 19 16 13 10 16 13 20
Answer

Question 2

　Answer the question about the data on under place.
13.2 19.5 12.7 11.2 13.6 13.8 x 12.3
(1)If the average is 13.8, what is x?
(2)If the average is 13.8, what is median?
Answer

Question 3

　Answer the question about the data on under place.
Point012345678910計
People001341011821040
What is the average, the variance and the standard deviation about the point?
Answer